Piece of timber or metal (in reality a strut) set obliquely against the side of a building as a support when it is in danger of falling, or when undergoing alterations or repairs. Shoring is therefore a collection of shores, i.e. some sort of structural framework supporting an unstable wall or building or the sides of an excavated area. Although usually applied to a temporary arrangement, shoring can be in evidence for many years (e.g. blighted sites in the City of London after the 1939–45 war, where shoring was still in existence well into the 1970s).